gem5  v21.2.1.1
Public Types | Public Member Functions | Public Attributes | List of all members
gem5::ArmISA::TableWalker::L1Descriptor Class Reference

#include <table_walker.hh>

Inheritance diagram for gem5::ArmISA::TableWalker::L1Descriptor:
gem5::ArmISA::TableWalker::DescriptorBase

Public Types

enum  EntryType { Ignore, PageTable, Section, Reserved }
 Type of page table entry ARM DDI 0406B: B3-8. More...
 

Public Member Functions

 L1Descriptor ()
 Default ctor. More...
 
uint64_t getRawData () const override
 
std::string dbgHeader () const override
 
uint8_t offsetBits () const override
 
EntryType type () const
 
bool supersection () const
 Is the page a Supersection (16 MiB)? More...
 
Addr paddr () const
 Return the physcal address of the entry, bits in position. More...
 
Addr paddr (Addr va) const
 Return the physcal address of the entry, bits in position. More...
 
Addr pfn () const override
 Return the physical frame, bits shifted right. More...
 
bool global (WalkerState *currState) const override
 Is the translation global (no asid used)? More...
 
bool xn () const override
 Is the translation not allow execution? More...
 
uint8_t ap () const override
 Three bit access protection flags. More...
 
TlbEntry::DomainType domain () const override
 Domain Client/Manager: ARM DDI 0406B: B3-31. More...
 
Addr l2Addr () const
 Address of L2 descriptor if it exists. More...
 
uint8_t texcb () const override
 Memory region attributes: ARM DDI 0406B: B3-32. More...
 
bool shareable () const override
 If the section is shareable. More...
 
void setAp0 ()
 Set access flag that this entry has been touched. More...
 
bool dirty () const
 This entry needs to be written back to memory. More...
 
bool secure (bool have_security, WalkerState *currState) const override
 Returns true if this entry targets the secure physical address map. More...
 
- Public Member Functions inherited from gem5::ArmISA::TableWalker::DescriptorBase
 DescriptorBase ()
 

Public Attributes

uint32_t data
 The raw bits of the entry. More...
 
bool _dirty
 This entry has been modified (access flag set) and needs to be written back to memory. More...
 
- Public Attributes inherited from gem5::ArmISA::TableWalker::DescriptorBase
LookupLevel lookupLevel
 Current lookup level for this descriptor. More...
 

Detailed Description

Definition at line 100 of file table_walker.hh.

Member Enumeration Documentation

◆ EntryType

Type of page table entry ARM DDI 0406B: B3-8.

Enumerator
Ignore 
PageTable 
Section 
Reserved 

Definition at line 104 of file table_walker.hh.

Constructor & Destructor Documentation

◆ L1Descriptor()

gem5::ArmISA::TableWalker::L1Descriptor::L1Descriptor ( )
inline

Default ctor.

Definition at line 120 of file table_walker.hh.

References gem5::ArmISA::TableWalker::DescriptorBase::lookupLevel.

Member Function Documentation

◆ ap()

uint8_t gem5::ArmISA::TableWalker::L1Descriptor::ap ( ) const
inlineoverridevirtual

Three bit access protection flags.

Implements gem5::ArmISA::TableWalker::DescriptorBase.

Definition at line 199 of file table_walker.hh.

References gem5::bits(), and data.

Referenced by gem5::ArmISA::TableWalker::doL1Descriptor().

◆ dbgHeader()

std::string gem5::ArmISA::TableWalker::L1Descriptor::dbgHeader ( ) const
inlineoverridevirtual

Implements gem5::ArmISA::TableWalker::DescriptorBase.

Definition at line 132 of file table_walker.hh.

◆ dirty()

bool gem5::ArmISA::TableWalker::L1Descriptor::dirty ( ) const
inline

This entry needs to be written back to memory.

Definition at line 248 of file table_walker.hh.

References _dirty.

◆ domain()

TlbEntry::DomainType gem5::ArmISA::TableWalker::L1Descriptor::domain ( ) const
inlineoverridevirtual

◆ getRawData()

uint64_t gem5::ArmISA::TableWalker::L1Descriptor::getRawData ( ) const
inlineoverridevirtual

Implements gem5::ArmISA::TableWalker::DescriptorBase.

Definition at line 126 of file table_walker.hh.

References data.

◆ global()

bool gem5::ArmISA::TableWalker::L1Descriptor::global ( WalkerState currState) const
inlineoverridevirtual

Is the translation global (no asid used)?

Implements gem5::ArmISA::TableWalker::DescriptorBase.

Definition at line 185 of file table_walker.hh.

References gem5::bits(), and data.

◆ l2Addr()

Addr gem5::ArmISA::TableWalker::L1Descriptor::l2Addr ( ) const
inline

Address of L2 descriptor if it exists.

Definition at line 213 of file table_walker.hh.

References data, and gem5::mbits().

Referenced by gem5::ArmISA::TableWalker::doL1Descriptor().

◆ offsetBits()

uint8_t gem5::ArmISA::TableWalker::L1Descriptor::offsetBits ( ) const
inlineoverridevirtual

Implements gem5::ArmISA::TableWalker::DescriptorBase.

Definition at line 138 of file table_walker.hh.

◆ paddr() [1/2]

Addr gem5::ArmISA::TableWalker::L1Descriptor::paddr ( ) const
inline

Return the physcal address of the entry, bits in position.

Definition at line 158 of file table_walker.hh.

References data, gem5::mbits(), panic, and supersection().

◆ paddr() [2/2]

Addr gem5::ArmISA::TableWalker::L1Descriptor::paddr ( Addr  va) const
inline

Return the physcal address of the entry, bits in position.

Definition at line 167 of file table_walker.hh.

References data, gem5::mbits(), panic, supersection(), and gem5::ArmISA::va.

◆ pfn()

Addr gem5::ArmISA::TableWalker::L1Descriptor::pfn ( ) const
inlineoverridevirtual

Return the physical frame, bits shifted right.

Implements gem5::ArmISA::TableWalker::DescriptorBase.

Definition at line 176 of file table_walker.hh.

References gem5::bits(), data, panic, and supersection().

◆ secure()

bool gem5::ArmISA::TableWalker::L1Descriptor::secure ( bool  have_security,
WalkerState currState 
) const
inlineoverridevirtual

Returns true if this entry targets the secure physical address map.

Implements gem5::ArmISA::TableWalker::DescriptorBase.

Definition at line 258 of file table_walker.hh.

References gem5::bits(), gem5::ArmISA::TableWalker::currState, data, PageTable, gem5::ArmISA::TableWalker::WalkerState::secureLookup, and type().

Referenced by gem5::ArmISA::TableWalker::L2Descriptor::secure().

◆ setAp0()

void gem5::ArmISA::TableWalker::L1Descriptor::setAp0 ( )
inline

Set access flag that this entry has been touched.

Mark the entry as requiring a writeback, in the future.

Definition at line 240 of file table_walker.hh.

References _dirty, and data.

◆ shareable()

bool gem5::ArmISA::TableWalker::L1Descriptor::shareable ( ) const
inlineoverridevirtual

If the section is shareable.

See texcb() comment.

Reimplemented from gem5::ArmISA::TableWalker::DescriptorBase.

Definition at line 231 of file table_walker.hh.

References gem5::bits(), and data.

◆ supersection()

bool gem5::ArmISA::TableWalker::L1Descriptor::supersection ( ) const
inline

Is the page a Supersection (16 MiB)?

Definition at line 151 of file table_walker.hh.

References gem5::bits(), and data.

Referenced by gem5::ArmISA::TableWalker::doL1Descriptor(), paddr(), and pfn().

◆ texcb()

uint8_t gem5::ArmISA::TableWalker::L1Descriptor::texcb ( ) const
inlineoverridevirtual

Memory region attributes: ARM DDI 0406B: B3-32.

These bits are largly ignored by M5 and only used to provide the illusion that the memory system cares about anything but cachable vs. uncachable.

Reimplemented from gem5::ArmISA::TableWalker::DescriptorBase.

Definition at line 224 of file table_walker.hh.

References gem5::bits(), and data.

◆ type()

EntryType gem5::ArmISA::TableWalker::L1Descriptor::type ( ) const
inline

Definition at line 144 of file table_walker.hh.

References data.

Referenced by gem5::ArmISA::TableWalker::doL1Descriptor(), and secure().

◆ xn()

bool gem5::ArmISA::TableWalker::L1Descriptor::xn ( ) const
inlineoverridevirtual

Is the translation not allow execution?

Implements gem5::ArmISA::TableWalker::DescriptorBase.

Definition at line 192 of file table_walker.hh.

References gem5::bits(), and data.

Member Data Documentation

◆ _dirty

bool gem5::ArmISA::TableWalker::L1Descriptor::_dirty

This entry has been modified (access flag set) and needs to be written back to memory.

Definition at line 117 of file table_walker.hh.

Referenced by dirty(), and setAp0().

◆ data

uint32_t gem5::ArmISA::TableWalker::L1Descriptor::data

The documentation for this class was generated from the following file:

Generated on Wed May 4 2022 12:14:59 for gem5 by doxygen 1.8.17